view/SchoolIdolFestivalSimulator.Main/NumericTextBox.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Security.Permissions;

namespace SQLReport.Main {

    /// <summary>
    /// マウスやキーボードによるペーストを無効にしたTextBox
    /// </summary>
    public class NumericTextBox:TextBox {
        const int WM_PASTE = 0x302;
        const int ES_NUMBER = 0x2000;

        protected override void WndProc(ref Message m) {
            if (m.Msg == WM_PASTE) {
                return;
            }
            base.WndProc(ref m);
        }
        
        public decimal ValueDecimal {
            get {
                decimal ret = 0;
                if (decimal.TryParse(this.Text.Trim(), out ret)) {
                    return ret;
                }
                return decimal.MinValue;
            }
        }
        public int Value {
            get {
                int ret = 0;
                if(int.TryParse(this.Text.Trim(), out ret)) {
                    return ret;
                }
                return int.MinValue;
            }
        }
        protected override void OnKeyPress(
                            System.Windows.Forms.KeyPressEventArgs e) {
            base.OnKeyPress(e);

            // 数字と小数点（1つ）以外入力させない
            if (e.KeyChar == '.') {
                if (this.Text.IndexOf(".") >= 0 || this.Text.Length == 0) {
                    e.Handled = true;
                }
            } else if ((e.KeyChar < '0' || e.KeyChar > '9') && e.KeyChar != '\b') {
                e.Handled = true;
            }
        }

        protected override CreateParams CreateParams {
            [SecurityPermission(SecurityAction.Demand,
                Flags = SecurityPermissionFlag.UnmanagedCode)]
            get {
                CreateParams parms = base.CreateParams;
                parms.Style |= ES_NUMBER;
                return parms;
            }
        }
    }
}